(PowerShell) How to Access Parts of a multipart/related HTTP Response

Demonstrates how to access the parts of a multipart/related response. This example sends a ficticious multipart/related request, and handles a ficticious multipart/related response.

We send the following multipart/related request:

Content-Type: multipart/related; start-info="text/xml"; type="application/xop+xml"; boundary="----=_Part_0_1744155.1118953559416"
Content-Length: 3453
SOAPAction: "some-SOAP-action"

------=_Part_1_4558657.1118953559446
Content-Type: application/xop+xml; type="text/xml"; charset=utf-8

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <Detail xmlns="http://example.org/mtom/data">
      <image>
        <xop:Include xmlns:xop="http://www.w3.org/2004/08/xop/include" href="cid:5aeaa450-17f0-4484-b845-a8480c363444@example.org" />
      </image>
    </Detail>
  </soap:Body>
</soap:Envelope>

------=_Part_1_4558657.1118953559446
Content-Type: image/jpeg
Content-ID: <5aeaa450-17f0-4484-b845-a8480c363444@example.org>


... binary data ...

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

$http = New-Object Chilkat.Http

$soapXml = New-Object Chilkat.Xml

# Build the following SOAP XML

# <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
#   <soap:Body>
#     <Detail xmlns="http://example.org/mtom/data">
#       <image>
#         <xop:Include xmlns:xop="http://www.w3.org/2004/08/xop/include" href="cid:5aeaa450-17f0-4484-b845-a8480c363444@example.org" />
#       </image>
#     </Detail>
#   </soap:Body>
# </soap:Envelope>

$soapXml.Tag = "soap:Envelope"
$soapXml.AddAttribute("xmlns:soap","http://schemas.xmlsoap.org/soap/envelope/")
$soapXml.UpdateAttrAt("soap:Body|Detail",$true,"xmlns","http://example.org/mtom/data")
$soapXml.UpdateAttrAt("soap:Body|Detail|image|xop:Include",$true,"xmlns:xop","http://www.w3.org/2004/08/xop/include")
$soapXml.UpdateAttrAt("soap:Body|Detail|image|xop:Include",$true,"href","cid:5aeaa450-17f0-4484-b845-a8480c363444@example.org")

$soapXml.EmitXmlDecl = $false
$xmlBody = $soapXml.GetXml()
$($xmlBody)

$req = New-Object Chilkat.HttpRequest
$req.HttpVerb = "POST"
$req.Path = "/something/someTarget"

$req.ContentType = "multipart/related; start-info=`"text/xml`"; type=`"application/xop+xml`""
$req.AddHeader("SOAPAction","some-SOAP-action")

$success = $req.AddStringForUpload2("","",$xmlBody,"utf-8","application/xop+xml; type=`"text/xml`"; charset=utf-8")

# The bytes will be sent as binary (not base64 encoded).
$success = $req.AddFileForUpload2("","qa_data/jpg/starfish.jpg","image/jpeg")

# The JPEG data is the 2nd sub-part, and therefore is at index 1 (the first sub-part is at index 0)
$success = $req.AddSubHeader(1,"Content-ID","<5aeaa450-17f0-4484-b845-a8480c363444@example.org>")

$http.FollowRedirects = $true

$useTls = $true
$resp = $http.SynchronousRequest("www.example.org",443,$useTls,$req)
if ($http.LastMethodSuccess -ne $true) {
    $($http.LastErrorText)
    exit
}

# Imagine the HTTP response is multipart related and is something like this:

# HTTP/1.1 200 OK
# Cache-Control: no-cache, no-store
# Pragma: no-cache
# Transfer-Encoding: chunked
# Content-Type: multipart/related; boundary=------------080001080500020607080905
# Expires: -1
# Server: Microsoft-IIS/10.0
# X-AspNet-Version: 4.0.30319
# X-Powered-By: ASP.NET
# Date: Wed, 19 Feb 2020 15:27:06 GMT
# 
# --------------080001080500020607080905
# Content-Type: application/xop+xml; charset=iso-8859-1
# Content-Id: RootPart
# Content-Transfer-Encoding: binary
# 
# <?xml version="1.0" encoding="iso-8859-1"?>
# <soapenv:Envelope xmlns:xcpt="...">
#   <soapenv:Header />
#   <soapenv:Body>
#     <xres:Transport profile="http://something.example.com/..." version="1.4">
#       <xres:TransportHeader>
# 	...
# 	...
#       </xres:TransportHeader>
#       <xres:TransportBody />
#     </xres:Transport>
#   </soapenv:Body>
# </soapenv:Envelope>
# --------------080001080500020607080905--

# To get the XML, load the full MIME of the response into a Chilkat MIME object.  Then get the body of the 1st sub-part.
$mime = New-Object Chilkat.Mime
$mime.LoadMime($resp.FullMime)

# Your code might verify that the Content-Type is indeed multipart/related.
$($mime.ContentType)
$("num parts = " + $mime.NumParts)

# Assuming it is, and the number of sub-parts is > 0
if ($mime.NumParts -gt 0) {
    $part0 = $mime.GetPart(0)
    # The Content-Type (in this ficticious example) should be "application/xop+xml"
    $("sub-part Content-Type: " + $part0.ContentType)
    # Now get the XML 
    $subPartXmlBody = $part0.GetBodyDecoded()
    $($subPartXmlBody)

}